Will this reduce video quality?

The video is kept as is when it is H.264, H.265, MPEG-4 or AV1; other video is converted to H.264. The audio is always saved as AAC.

What if my audio is shorter than the video?

On your device, the audio repeats until the video ends. With Upload to Toolsvana it does not repeat, and the result ends with the shorter file.

The result is trimmed to the video length.

Combine audio tracks with video files

Choose a videoMP4, MOV, WebM, MKV, AVI and more · up to 500 MB

Choose an audio fileMP3, WAV, AAC, M4A, FLAC, OGG and more · up to 100 MB

Replace the video's own sound (otherwise mix with it)

Audio volume100%

Audio start delay0sDelays the added audio, for example to line up a voice-over.

Audio longer than the video is cut at the end of the video; shorter audio repeats until the video ends.

Where to convertOn this deviceYour files are not uploaded.Upload to ToolsvanaFor files up to 95 MB together. The files are uploaded for processing.

Your result appears here.

Choose a video and an audio file to begin.

Good to know

The result is an MP4 with AAC audio. H.264, H.265 and AV1 video is kept as it is; other video is converted to H.264.
Mixing needs a video with its own sound; without one, the new audio is used alone.
The preview plays the volume up to 100%; the saved file uses the full setting.
The file is named after your video with _with_audio.mp4 at the end.